Yeah, until microsoft says "Sup there lil buddy? Running an unsupported system? Oof. The next update is gonna really turn it inside-out"
I think at a certain point you need to just call it quits with that sort of bullshit. I have my dignity. I'm a fucking grown adult. I'm not going to spend my spare time haplessly looking online to unfuck the new current set of fuckery. Just take the fucking bullet. Learn linux. Congrats you're playing whack-a-mole with a trillion dollar corporation and prolonging your misery. This is stupid.
Take backups and disable the updates with group policy. OP just wanted to install Windows 11.
Well that's never happened before (with Windows anyway), so it's not likely to happen now.
This is exactly my experience - I have a Lenovo W530 from 2013, it has an i7, 32gb RAM and SSDs (RAID0 for performance, backups are off-device) - and it is STILL lightning fast.
However - EVERY single trick I have tried... the above command, LTSC, Enterprise edition, etc, results in a situation where after installation a few days (or hours) and some updates get installed, and... blue-screen-of-death on every boot.
Gave up, installed Linux - still working through some issues (GPU driver compatibility), but overall it is a much better experience...